In order to develop a new craft and equipment for wet-process phosphoric acid(WPA) purification,a new type of reciprocating plate column was designed on the basis of physical properties of extraction system. The optimal structural parameters and operation parameters for three main processes like extraction,washing and re-extraction process were found out through laboratory experiments. Extraction: the distance between plates is 7 cm,vibration frequency is 200 r/min;

An impedance technique is developed to determine the dispersed-phase holdup of the liquid-liquid dispersions in the batched agitated tank extraction unit and the dispersed-phase holdup profiles of the two phase flow in the reciprocating plate extraction column by measuring the conductance of column the dispersions.

In a study for the development of the in-situ uranium and plutonium electro-reduction process and equipement, the dependence of U(VI)electro-re-duction rates on component concentrations has been investigated with the system UO2(NO3)2-HNO3-N2H5NO3(H2O)/30% TBP(OK). The electrolytic cell employed is a glass col.umn with an internal diameter of 50 mm. The sieve plates are made of titanium, serving as cathode, the anodical central rod is made of platinum or stainless steel, and the polyethylene material is used...

In a study for the development of the in-situ uranium and plutonium electro-reduction process and equipement, the dependence of U(VI)electro-re-duction rates on component concentrations has been investigated with the system UO2(NO3)2-HNO3-N2H5NO3(H2O)/30% TBP(OK). The electrolytic cell employed is a glass col.umn with an internal diameter of 50 mm. The sieve plates are made of titanium, serving as cathode, the anodical central rod is made of platinum or stainless steel, and the polyethylene material is used for the insulators between anode and cathode. The oscillation of reciprocating plate makes both phases dispersed.The U(IV) formation rates are measured under various component concentrations.The results show that the presence of hydrazine as the supporting reduc- tant or stabilizer is necessary for the reduction of U(VI). In the range of experimental concentrations, the U(VI) reduction rates are mainly dependent on the U(VI) concentration in the system and slightly dependent on the HNO3 and N2H6+ concentrations. The data for the present system are well correlated by the following rate equation:here the rate constant k is a function of temperature, k = 0. 00187 at t = 25℃.

The hydrodynamic performance of a reciprocating plate column used to extract HAc from CH_3COOCH(CH_3)_2/HAc-Na_2SO_4-H_2O system has been studied. Two hydrodynamic relationships for this system have been determined by means of data treatment of physical properties and holdup. A design example has been given.

The flow behaviours of three extraction systems were studied. Experiments on 30%TBP (OK)-water system showed the obvious effect of wettability of dispersed phase on perforated plate upon holdup. When amplitude was lower than 0.6cm, axial dispersion was not serious, and the reciprocating plate extraction column was found to possess good performance for the 30% TBP(OK)-water system.